Compensator for automatic firearms



March 9, 1943. RElSlNG 2,315,669

COMPENSATOR FOR AUTOMATIC FIREARMS Filed Jan. 6, 1941 Patented Mar. 9, 1943 U TE it? 2,313,889 COMPENSATOB, FOR AUTOMATIC FIREARMS Eugene G. Beising, Hartford, Conn. Application January 6, 1941, Serial No. 373,224

6 Claims.

This invention relates to compensators and climb arresters, which are particularly adapted for use with automatic firearms of the machine gun type, being herein illustrated and disclosed as applicable to .45 caliber light automatic and semi-automatic rifles.

Objects of the invention include the provision of a compensator and climb arrester for use with extreme rapid fire firearms, especially where single shots do not produce appreciable recoil or climb tendency, but rapid automatic fire produces a cumulative recoil and especially a cumulative climb effect whereby accuracy of aim is made dimcult; the provision of a simple and inexpensive yet emcient compensator and climb arrester which easily lends itself to manufacture and the provision of a climb arrester which is positive in its operation and at the same time avoids objectionable breech flash-back.

Other objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompanying drawing, in which Fig. 1 is a view in elevation of adevice embodying the present invention;

Fig. 2 is a view in plan of the device, looking in the direction of arrow 2 in Fig. 1;

Fig. 3 is a section on line '88 of Fig. 2; and

- Fig. 4 is an end view looking in the direction of arrow 8 in Fig. 1.

The muzzle climb or jump of firearms is a well-recognized problem, and many devices have been proposed to overcome it. However, there are modern rapid-fire automatic rifles of large caliber and light weight in which single shots do not produce an appreciable climb or recoil, but wherein fire of 600 projectiles per minute, for example, produces a cumulative climb, and even recoil. It has been found that prior art compensators are not particularly well adapted for these rifles, some of them even producing a reverse motion of the arm which is naturally objectionable. This invention relates to a device which overcomes this particular problem.

The numeral l indicates the muzzle of a short barrel for a large caliber automatic rifie of about 6 or 7 pounds weight. This firearm is adapted to use standard ammunition for side-arms, and it will be apparent that a single shot from such a gun will produce little objectionable recoil or climb, but due to the rapidity of fire, a cumulative gas eifect will produce a climb and some recoil. The present compensator could be made integral with the barrel but it is contemplated that it will be a separate part attached firmly in a single position to the muzzle, and will not particularly affect the firearm on single shots, but will overcome the cumulative climb and recoil above mentioned.

The device comprises a substantially cylindrical member i2 of larger-bore than the barrel, as can be seen irr Fig. 3, and this member has some convenient means of attachment (not shown) to the muzzle ID. A series of apertures or slots it are arranged in what may be termed the top surface of member l2, and these apertures are all similar except that they may increase in length in a direction away from the gun barrel. These slots provide for a pre-release of at least a part of the expanding gases and particularly on single shots allow released a substantial part of the gases prior to the action of the climb arrester surfaces to be described, so

,that the single shots will not be as greatly afiected by the device as rapid fire shots.

The forward end of member i2 is"provided with an opening the full diameter of the bore thereof, and this is eflected by the stopping or cutting short of the member H2 at it, on the upper one-half thereof. The surface it is Just normal to the axis of the member 82 and extends in a semi-circle as clearly seen in Fig. 4. The lower one-half of the member i2, however, extends forwardly for a short distance in exact continuance of its wall, see numeral i8, and this provides a semi-circular shelf in effect extending beyond the end of the member.

At the forward end of the semi-circular shelf i8, there is a partial cone-like element 29 which extends in prolongation of the shelf is. The base of the element 20 is coextensive with the shelf i8 and narrows toward the ma of member l2. If continued, element 20 would form onehalf of a hollow cone, but an aperture 32 for passage of projectiles is provided.

In the operation of the device, the gases on single shots will be partly pre-released by slots is, and the remainder will be released at the open end of the member l2 As the shelf i8 extends beyond the open end, the gases will release with small impingement on cone-like element 20, so that a small recoil and climb preventing eilect will result. However, with a rapid fire of several hundred shots per minute, the gases do not have the opportunity to be pre-released at slots M to as great a degree as on single shots, and a relatively greater impingement on the element 20 resultahence a greater climb and recoil arresting efiect is obtained. Even here. however, the shelf i8 provides for a fairly free can be no flash back at the breech or the shell ejection aperture.

Having thus described my invention and the advantages thereof, I do not wish to be limited to the details herein disclosed, otherwise than as set forth in the claims, but what I claim is:

1. In a device of the class described, a climb arrester for use with rapid-fire automatic firearms capable of firing several hundred shots per minute, said arrester comprising a substantially cylindrical hollow elongated member, an opening at the forward end of said member, a shelf partly surrounding said opening and extending therebeyond parallel to said member, and means at the forward end of said shelf to deflect explosion gases upwardly, said means comprising a semi-conical extension of said shelf.

2. A device as recited in claim 1 in which said member is .provided with means to partially prerelease said gases in advance of said opening in an upward direction only.

3. A device of the class described comprising an elongated hollow cylinder having an open end, a shelf in prolongation of a substantial part of a wall of said cylinder at said open end, and an inclined projection extending from said shelf in a direction away from said cylinder and towards its axis, said projection being located wholly be-- low said axis so as to leave all gas escaping there past completely unimpeded in an upward direction.

4. A device of the class described comprising an elongated hollow expansion chamber having one end open, said open end being of the same area as a section of said chamber, a shelf conforming in shape to said section and extending beyond said open end, a tapered projection on said shelf extending therefrom away from said chamber, both shelf and projection being completely uncovered in an upward direction for totally unimpeded release of explosive gases in said direction.

5. A device of the class described comprising an elongated hollow substantially cylindrical gas expansion chamber, a generally semi-circular shelf in extension of saidchamber at one side thereof, said shelf being of a length many times less than the length of the chamber, a projection in prolongation of said shelf, said projection being in the form of a truncated hollow halfcone, said half-cone having its base coextensive with said shelf and of the same radius, and tapering in a direction away from said chamber, said shelf and half-cone forming a cup-like extension for said chamber at said one side, said cup-like extension being open and said shelf being located wholly to one side of a diameter of said chamber.

6. A device of the class described comprising an elongated hollow substantially cylindrical gas expansion chamber, a generally semi-circular shelf in extension of said chamber at one side thereof, said shelf being of a length many times less than the length of the chamber, a projection in prolongation of said shelf, said projection being in the form of a truncated hollow halfcone, said half-cone having its base coextensive with said shelf and of the same radius, and tapering in a direction away from said chamber, said shelf and half-cone forming a cup-like extension for said chamber at said one side, said cup-like extension being completely open in an upward direction for release of explosive gases in said direction, and a series of slots in a wall of said chamber at a side thereof opposite said one side.

EUGENE G. REISING. 

